Periodic solutions for nonlinear system of differential equations of third order with conditions
By: Butrus, Raad N.; Jamil, Ghadah Shukr. al-Tarbiyah wa-al-Ilm : Majallat ilmiyah lil-Buhuth al-Ilmiyah al-Asasiyah. Vol. 26, no. 1 (Mar. 2013), pp.126-139, 14 p.
Subjects: Mathematical models